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+<h1>VGA Signal 640 x 480 @ 60 Hz Industry standard timing</h1>
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+<h2>General timing</h2><table border=1><tr><td>Screen refresh rate</td><td>60 Hz</td><tr><td>Vertical refresh</td><td>31.46875 kHz</td><tr><td>Pixel freq.</td><td>25.175 MHz</td></table><h2>Horizontal timing (line)</h2>Polarity of horizontal sync pulse is negative.<p><table border=1><tr><td>Scanline part</td><td>Pixels</td><td>Time [&micro;s]</td><tr><td>Visible area</td><td>640</td><td align=right>25.422045680238</td><tr><td>Front porch</td><td>16</td><td align=right>0.63555114200596</td><tr><td>Sync pulse</td><td>96</td><td align=right>3.8133068520357</td><tr><td>Back porch</td><td>48</td><td align=right>1.9066534260179</td><tr><td>Whole line</td><td>800</td><td align=right>31.777557100298</td></table><h2>Vertical timing (frame)</h2>Polarity of vertical sync pulse is negative.<p><table border=1><tr><td>Frame part</td><td>Lines</td><td>Time [ms]</td><tr><td>Visible area</td><td>480</td><td align=right>15.253227408143</td><tr><td>Front porch</td><td>10</td><td align=right>0.31777557100298</td><tr><td>Sync pulse</td><td>2</td><td align=right>0.063555114200596</td><tr><td>Back porch</td><td>33</td><td align=right>1.0486593843098</td><tr><td>Whole frame</td><td>525</td><td align=right>16.683217477656</td></table> <div id="navbar">
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diff --git a/docs/video_timing.txt b/docs/video_timing.txt
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+5MHZ IS VALID
+128.0 K VRAM, up to  524280  pixels.
+Pixel Clock (Mhz) > 25.175
+Signal Clock (Mhz) > 5
+Horizontal Resolution > 640
+Vertical Resolution > 480
+Horzontal Front Porch:  6
+Horzontal Sync:         8
+Horzontal Back Porch:   5
+
+Vertical Front Porch:  10
+Vertical Sync:         4
+Vertical Back Porch:   18
+
+Expected exact frequency:  59.15 Hz
+Image pixel count:  307200  of maximum  524280
+Words per line:  160
+
+8MHZ IS VALID
+80.0 K VRAM, up to  327680  pixels.
+Pixel Clock (Mhz) > 25.175
+Signal Clock (Mhz) > 8
+Horizontal Resolution > 640
+Vertical Resolution > 480
+Horzontal Front Porch:  11
+Horzontal Sync:         13
+Horzontal Back Porch:   7
+
+Vertical Front Porch:  10
+Vertical Sync:         4
+Vertical Back Porch:   18
+
+Expected exact frequency:  58.88 Hz
+Image pixel count:  307200  of maximum  327680
+Words per line:  160
+
+800X600
+128.0 K VRAM, up to  524288  pixels.
+Pixel Clock (Mhz) > 40
+Signal Clock (Mhz) > 8
+Horizontal Resolution > 800
+Vertical Resolution > 600
+Horzontal Front Porch:  8
+Horzontal Sync:         13
+Horzontal Back Porch:   7
+
+Vertical Front Porch:  10
+Vertical Sync:         4
+Vertical Back Porch:   18
+
+Expected exact frequency:  58.6 Hz
+Image pixel count:  480000  of maximum  524288
+Words per line:  200

Screen refresh rate	60 Hz
Vertical refresh	31.46875 kHz
Pixel freq.	25.175 MHz
Scanline part	Pixels	Time [µs]
Visible area	640	25.422045680238
Front porch	16	0.63555114200596
Sync pulse	96	3.8133068520357
Back porch	48	1.9066534260179
Whole line	800	31.777557100298
Frame part	Lines	Time [ms]
Visible area	480	15.253227408143
Front porch	10	0.31777557100298
Sync pulse	2	0.063555114200596
Back porch	33	1.0486593843098
Whole frame	525	16.683217477656